640830960000 has 1280 divisors, whose sum is σ = 2947366540800. Its totient is φ = 133125120000.

The previous prime is 640830959963. The next prime is 640830960037. The reversal of 640830960000 is 69038046.

640830960000 is a `hidden beast` number, since 6 + 40 + 8 + 3 + 0 + 9 + 600 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (640830959963) and next prime (640830960037).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 166318074 + ... + 166321926.

It is an arithmetic number, because the mean of its divisors is an integer number (2302630110).

Almost surely, 2^640830960000 is an apocalyptic number.

640830960000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640830960000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1473683270400).

640830960000 is an abundant number, since it is smaller than the sum of its proper divisors (2306535580800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640830960000 is a wasteful number, since it uses less digits than its factorization.

640830960000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3914 (or 3881 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

Adding to 640830960000 its reverse (69038046), we get a palindrome (640899998046).

The spelling of 640830960000 in words is "six hundred forty billion, eight hundred thirty million, nine hundred sixty thousand".